senator roger wicker and the other was sent to president barack obama. they both can takened powdery substances. we're learning this from an fbi operations bulletin that went out we exclusively obtained. the it confirms both letters were sent from memphis, tennessee on april 8th. they contained the following message. to see iran and not expose it to become a silent partner to its continuance. both letters were signed, i am kc and i approved this message. the initial tests on the wicker letter were positive for ricin. we don't know what any test results were on the obama letter. both letters were intercepted before they reached their intended address, the u.s. capitol building and the white house. moments ago, senator minority leader mitch mcconnell says that means that security systems that have been put in place worked. >> i would like to recognize the postal and law enforcement officials for their excellent work in detecting and preventing this threat before it even reached the capitol. they proved the proactive measures we put in place do in fact work